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F. KUHN, J. AHAND, AND J. G. SPIESS.

ELECTRICALLY HEATED TOOL.

APPLICATION FILED .IAN.25. 1919.

Pmenfd sept 16, 1919.

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iin sTATEs Parnu-'r orrion FIRA "K KUHN, .TAY A. HAND, AND JULES G.SPIESS, F DETBGIT, MCHIGAN, ASIGNGBS T0 AMERICAN ELECTRICAL HEATERCOMPANY, 0F DETROIT, MICHIGAN, A. GRP

Barron or MICHIGAN.

nLECrmcALLY-Hnnrnn Toor..

Speciicaton of Letters Patent. Patented Sept. 16, i919.

Application led January 25, 1919. Serial No. 273,077.

To all whom t may concern:

Be it known that we, FRANK KUHN, JAY A. HAND, and JULES G. Sr1nss, allcitizens of the United States of Amerlca, residing 5 at Detroit, in thecounty of Vayne and State of Michigan, have invented certain new anduseful Improvements in Electrically-Heated Tools, of which the followingis a specification, reference being had therein to the accompanyingdrawing.

The invention relates to electrically heated tools, such as solderingirons, and consists of a construction which facilitates the attachmentand detachment of th soldering point, and further in various features ofconstruction as hereinafter set forth.

In the drawings: Figure l is a longitudinal section through the tool;

Figs. 2, 3, 4E, 5 and 6 are perspective views of the various elements ofthe tool detached.

A is the shank of the tool for attachment to a handle (not shown), B theheating unit,

preferably a flat insulated and armored ele ment, and C C areheat-absorbing and distributing members on opposite sides of the elementand forming thereof complementary portions of a cylinder.

In soldering tools the point is usually formed of copper and it isdesirable to employ rolled stock in forming the same. To

permit of the use of such material I have devised a construction forrigidly clamping the point and maintaining the same good heat-conductingrelation to the heat-dis trib uting bodies C C which embrace the unitB.v As shown, D is a cylindrical sleeve surrounding the members C C',and'E E are y wedge rings at opposite ends of this sleeve 40 whichengage tapering ends of the members C C. The ring E is secured to thesleeve D by an inturned flange D and the ring E is externally threadedfor engaging an internally threaded portion lof the sleeve D. Thus byscrewing up the ring E', which'is provided with a wrench-hold portionE2, the

members C C- will be clamped into lirincontact with the element B. Thesoldering point F is formed of round bar stock, having its forward endbeveled, as indicated at Cr, and its rear end G cut off in a planeperpendicular to its longitudinal axis. To transfer the heat from themembers C C to the point F the end G thereof must be held in closecents/Ct with the forward ends of said members C C. For this purpose asecond sleeve H surrounds the sleeve D, be-

ing slightly spaced therefrom to form an air gap for heat insulation. Atthe forward end of this sleeve is a ring member I, the aperture in whichwill receive the member F, said ring being tapered eXter nally andinternally. J are segmental wedge,v members fitting within the ring I,their inner faces being cylindrical segments for fitting the member F.The sleeve H engages the ring I by means of an inturned flange H and atthe opposite end of the sleeve H is a ring K which is internallythreaded to engage a threaded portion ofthe sleeve and is also providedwith a bearinfr portion for /engaging the end of the ring In. Theconstruction is such that by screwing up the ring K the sleeve H will bedrawn rearward', carrying with it the tapering ring I which bearsagainst the wedge members J. The latter abut against the ring E andconsequeutly any rear movement of thesleeve H will have the effect offorcing the wedges radially inward so as to clamp the cylindrical memberF. Thus the screwing up of the member K will simultaneously clamp thepoint member F and draw the same rearward; thereby pressing the rearfaces Cr against the forward ends of the members C and C. This willproduce goed heat-eonducting contact so that the heat which istransmitted from the unit to'the members C C will be conducted into themember F.

With the construction as described, when1 ever it is desired to removethe point F either" for re-shaping the same or for purpose of renewal,this can be quickly done without disturbing either the element B or theheat. distributing bodies C C. This is desirable as the heating ofthese, bodies has a tendency to warp or distort the same so that whenunclamped it is dicult to secure as good contact for heat conduction. Onthe other hand, the contact between the members C C and the point Fbeing an end Contact there is little tendency for these surfaces to become distorted. l

What we claim as our invention is:

l. Inan electrically heated tool, the eombnation with a flat heatingunit. and heat distributing bodies on opposite sides thereof formingcomplementary portions of a cylinder, of a sleeve surrounding saidheat-distrbutng bedies, means operated by an endif Wise movement et'seid sleeve for clamping said lieiLtfdistributing bodies against saidunit, n member to be heatedv having" end contnet with saidlient-distributing bodies, :t clamp 'for engaging seid member, und esleeve surrounding` said first-mentioned sleeve, engaging said clampingxneznis to eetunte the seme by en endwise movement.

In :in electrically heated tool, the com bin-:dimi with n heating :inddistributing unit oi' cylindrical form, of a, member to be heatedliu-ving end eonteet with said heating :md distributing unit, n clampfor engaging said memlber, 1L Isleeve surrounding and spzi'eed, fromsaid heating `and distributing unit engaging said clamp, sind means atthe rear end of said heating and distributing unit :for drawing seidsleeve rearward to simultaneously clamp seid member and press the sameendwise against said unit.

l'n an electrically hee-ted tool, the combination with e Het heatingunit and heetdistributing bodies on opposite sides thereof havingtapering ends, ei' n'eilgge rings engaging the. tapering ends ol seidbodies, o, sleeve sin'roundinLY sind bodies end eonneetingj said ringswith n. threaded engagement with one tliereoy al, member to be heatedhaving end. Contact with seid heat-distribnting bodies7 :i tapering ringsnrrinnulii'lg said member, ai plurality oit' wedges Within saidtapering ring and fitting against sa-id meinber, e sleeve engagingsnid'tzqaering ring; and surrounding' seid first-mentifmed sleeve, beingspaced therefrom, and. e ring member at the rear end et' seid slee-vehaving a threaded engagement therewith and bearing zig-einst the ringengaging tbe nist-mentioned sleeve, for the. purpose described.

1n testimony 'whereof We affix our signer tures.

FRANK KUHN. JAY A. HAND. JULES G. SPIESS.

